IDirectFBDataBuffer: Fix crash in non-pure Voodoo clients due to new DataBuffer dispatch.
IDirectFBDataBuffer: Fix crash in non-pure Voodoo clients due to new DataBuffer dispatch.

deniskropp/DirectFB,jcdubois/DirectFB,lancebaiyouview/DirectFB,kevleyski/directfb,sklnet/DirectFB,Distrotech/DirectFB,kevleyski/directfb,sklnet/DirectFB,jcdubois/DirectFB,DirectFB/directfb,kaostao/directfb,mtsekm/test,mtsekm/test,mtsekm/test,kevleyski/DirectFB-1,DirectFB/directfb,deniskropp/DirectFB,DirectFB/directfb,lancebaiyouview/DirectFB,jcdubois/DirectFB,kevleyski/DirectFB-1,deniskropp/DirectFB,djbclark/directfb-core-DirectFB,lancebaiyouview/DirectFB,Distrotech/DirectFB,kaostao/directfb,djbclark/directfb-core-DirectFB,dfbdok/DirectFB1,sklnet/DirectFB,dfbdok/DirectFB1,kevleyski/DirectFB-1,lancebaiyouview/DirectFB,djbclark/directfb-core-DirectFB,kevleyski/directfb,kevleyski/directfb,kaostao/directfb,dfbdok/DirectFB1,sklnet/DirectFB,Distrotech/DirectFB,deniskropp/DirectFB,kevleyski/DirectFB-1,djbclark/directfb-core-DirectFB